@book { EntwicklungvonPrivateEquityPortfoliounternehmeninDeutschland,
    title = "Entwicklung von Private-Equity-Portfoliounternehmen in Deutschland",
    author = "Peter {Henssen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108138"
}